Evolution of flow characteristics through finite-sized wind farms and influence of turbine arrangement

V. Sharma, G. Cortina, F. Margairaz, M. B. Parlange, M. Calaf

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

Evolution of flow characteristics through finite-sized wind farms and the influence of the wind-farm configuration on modulating this evolution is explored through numerical simulations. The principal aim for the study is to identify regions of flow-adjustment and flow equilibrium within the wind farm. Towards this aim, a suite of five large-eddy simulations (LES) of the neutral atmospheric boundary layer with extremely long streamwise domains are performed with embedded finite-sized wind farms of different streamwise and spanwise spacing. Three diagnostic variables, namely, the wind-farm induced effective surface roughness, the wake viscosity and the wake-expansion coefficient are computed using the LES-generated database and are used to characterize the flow. Computation of the diagnostic variables is relevant to the wind-energy community in different contexts ranging from parametrization of wind farms in weather and climate models, to wind-farm design and optimization based on wake-models and eddy-viscosity type Reynolds-averaged Navier-Stokes solvers. Results show that flow equilibrium is achieved in the ‘most dense’ configuration of sx≈8D,sy≈5D at approximately the 19th row. Results also indicate that the streamwise spacing plays a dominant role determining the rate at which flow-adjustment is achieved within the wind farm.

Original languageEnglish
Pages (from-to)1196-1208
Number of pages13
JournalRenewable Energy
Volume115
DOIs
Publication statusPublished - 1 Jan 2018
Externally publishedYes

Keywords

  • ABL-wind farm interaction
  • Effective roughness
  • Large-eddy simulation
  • Wake viscosity
  • Wake-expansion coefficients

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